/*
	This file is part of AVRCppLib.

    AVRCppLib is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    AVRCppLib is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with AVRCppLib.  If not, see <http://www.gnu.org/licenses/>.

    Copyright (C) Maxime Lemonnier 2007-2011
 */

#ifndef BUFFER_ITERATOR_H_
#define BUFFER_ITERATOR_H_

#include "Iterator.h"

template <class ElementType>
class BufferIterator : public Iterator<ElementType> {

public :
	bool hasNext()
	{
		return (position < size);
	}

	bool hasPrevious()
	{
		return (position > 0);
	}

	ElementType * current()
	{
		return (ElementType *)(memory + position * stepSize);
	}

	ElementType * next()
	{
		if(!hasNext())
			return NULL;

		position++;

		return current();
	}

	ElementType * previous()
	{
		if(!hasPrevious())
			return NULL;

		position--;

		return current();
	}

	BufferIterator(ElementType * memory, size_t size) : memory(memory), size(size), stepSize(sizeof(ElementType)), position(0)
	{

	}

	BufferIterator(void * memory, size_t size, size_t stepSize) : memory((uint8_t*)memory), size(size), stepSize(stepSize), position(0)
	{

	}

private:
	uint8_t * memory;
	size_t size;
	size_t stepSize;
	uintmax_t position;
};
#endif /* BUFFER_ITERATOR_H_ */
